Enable the use of fplll-5 for coefficient recognition.
Thanks to Jan Engelhardt <firstname.lastname@example.org> for figuring out the API of fplll-5. * configure.ac: If fplll-4 is not found, check for fplll-5. * src/lll.cpp (lll_fplll): Add a version working with fplll-5, and simplify the code for fplll-4.
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